/**
 *    Copyright 2009-2016 the original author or authors.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */
package com.yinsin.jpabatis.executor.statement;

import java.sql.SQLException;
import java.sql.Statement;

/**
 * Utility for {@link java.sql.Statement}.
 *
 * @since 3.4.0
 * @author Kazuki Shimizu
 */
public class StatementUtil {

	private StatementUtil() {
		// NOP
	}

	/**
	 * Apply a transaction timeout.
	 * <p>
	 * Update a query timeout to apply a transaction timeout.
	 * </p>
	 * 
	 * @param statement
	 *            a target statement
	 * @param queryTimeout
	 *            a query timeout
	 * @param transactionTimeout
	 *            a transaction timeout
	 * @throws SQLException
	 *             if a database access error occurs, this method is called on a
	 *             closed <code>Statement</code>
	 */
	public static void applyTransactionTimeout(Statement statement, Integer queryTimeout, Integer transactionTimeout) throws SQLException {
		if (transactionTimeout == null) {
			return;
		}
		Integer timeToLiveOfQuery = null;
		if (queryTimeout == null || queryTimeout == 0) {
			timeToLiveOfQuery = transactionTimeout;
		} else if (transactionTimeout < queryTimeout) {
			timeToLiveOfQuery = transactionTimeout;
		}
		if (timeToLiveOfQuery != null) {
			statement.setQueryTimeout(timeToLiveOfQuery);
		}
	}

}
